is it possible to run windows vista/7-64 on vista 32 ?

[whatsup]

thanks in advanced

[Perryg]

Maybe
Chapter 3.1.2. 64-bit guests

[whatsup]

thank you very much sir.
someone gave me links, and what i unserstood is:
1: if i have vt hardware, i can run 64 guest on 32 host
2: if i have a 64 host, i can run 64 guest even i don't have vt hardware

in both cases i need of course a cpu with 64 set instructions.

is this correct ?

if so, i'll have to install sometime a 64 host, since my intel T3400 doesn't have vt hardware.

[Perryg]

Sorry you will not be able to run 64-bit guests. The processor does not support hardware virtualization (VT-x)

http://ark.intel.com/Product.aspx?id=35583

[whatsup]

Starting with Version 2.0, VirtualBox also supports 64-bit guest operating systems.

Starting with Version 2.1, you can even run 64-bit guests on a 32-bit host operating system, so long as you have sufficient hardware.

In detail, 64-bit guests are supported under the following conditions:

1. You need a 64-bit processor with hardware virtualization support (see chapter
1.2, Software vs. hardware virtualization (VT-x and AMD-V), page 10).

2. You must enable hardware virtualization for the particular VM for which you
want 64-bit support; software virtualization is not supported for 64-bit VMs.
Note: On most systems, the hardware virtualization features first need to be
enabled in the BIOS before VirtualBox can use them.

3. If you want to use 64-bit guest support on a 32-bit host operating system, you
must also select a 64-bit operating system for the particular VM. Since supporting
64 bits on 32-bit hosts incurs additional overhead, VirtualBox only enables this
support upon explicit request.


On 64-bit hosts, 64-bit guest support is always enabled, so you can simply install a 64-bit operating system in the guest.

from the last sentence i understood that if i have a 64 host, vbox doesn't require vt-x.
but from you i understand that even if i install 64 host, vbox still need vt-x.

is there a chance to see a future version that don't need vt-x to run, at least on 64 host ?

[stefan.becker]

No. Why developing software for the past? Every modern CPU instead of ATOM support this feature.

[mpack]

Why developing software for the past? Every modern CPU instead of ATOM support this feature.

Um. I'm pretty sure that's not true - at least it wasn't when I last checked, which is about a year ago. At that time Intel saw VT-x as a value feature, present in some lines, absent in others. And I'm talking modern Core 2 Duo processors here.

[stefan.becker]

Maybe true. For that im using AMD.

[Perryg]

On 64-bit hosts, 64-bit guest support is always enabled, so you can simply install a 64-bit operating system in the guest.

This is simply not true. If you have a 64-bit processor that does not support hardware virtualization you can not install a 64-bit guest.
Trying to do so will issue the following result in the install process.

• This kernel requires an x86-64 CPU, but only detected an i686 CPU.
  Unable to boot - please use a kernel appropriate for your CPU.